PRELIMINARY SPECIFICATION (V1.5)

FREQUENCY SYNTHESIZER

KB8821/22/23

1

99-06-15

INTRODUCTION

The KB8821/22/23 are high performance dual frequency syn-

thesizers with integrated prescalers designed for RF operation

up to 1.2GHz/2.0GHz/2.5GHz and IF operation up to 520MHz.

The KB8821/22/23 contain dual-modulus prescalers. The RF

synthesizer adopts a 64/65 or an 128/129 prescaler(32/33 or

64/65 for the KB8823) and the IF synthesizer adopts an 8/9 or

a 16/17 prescaler.

Using a proprietary digital phase-locked-loop technique, the

KB8821/22/23 have linear phase detector characteristic and

can be used for very stable, low noise local oscillator signal.

Supply voltage can range from 2.7V to 4.0V. The KB8821/22/

23 are now available in a 20-TSSOP/24-QFN package.

FEATURES

• Operating voltage range : 2.7 ~ 4.0V

• Selectable power saving mode(Icc=1uA typical @3V)

• Dual modulus prescaler :

KB8821/22

(RF) 64/65 or 128/129

KB8823

(RF) 32/33 or 64/65

KB8821/22/23

(IF) 8/9 or 16/17

• Programmability via serial bus interface

• No dead-zone PFD

• Variable charge pump output current

• High speed lock mode

ORDERING INFORMATION

* QFN : Quad Flat Non-leaded(see Addendum).

Device

Package

Tem. Range

KB8821/22/23

20-TSSOP-225 -40 ~ +85

°C

KB8821/22/23

24-QFN*

-40 ~ +85

°C

20-TSSOP-225

APPLICATIONS

• Cellular telephone systems : KB8821

• Portable wireless communications : KB8822

(PCS/PCN, cordless)

• Wireless Local Area Networks (W-LANs)

: KB8823

• Other wireless communication systems

BLOCK DIAGRAM

Figure 1. BLOCK DIAGRAM

RF

Serial Data Control

Charge

Pump

finRF

foLD

N Counter

CLOCK

LE

DATA

RF

Phase

Detector

RF

RF

Prescaler

finRF

+

-

RF

LD

CPoRF

finIF

finIF

OSCin

RF

R Counter

IF

R Counter

IF

Prescaler

IF

N Counter

Detector

IF

Phase

Pump

IF

Charge

CPoIF

IF

LD

+

-

foLD

Data Out

Multiplexer